package cn.com.kh;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class HttpClientProxy {
    private static final Log log = LogFactory.getLog(HttpClientProxy.class);

    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url   发送请求的URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param, String pIP, int pPort) {
        String result = "";
        BufferedReader in = null;
        try {
            log.info("发送请求URL:" + url);
            log.info("发送请求参数:" + param);
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            URLConnection connection = null;
            if (pIP != null && pIP.length() > 0) {
                Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(pIP, pPort));

                // 打开和URL之间的连接
                connection = realUrl.openConnection(proxy);
            } else {
                connection = realUrl.openConnection();
            }
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

            // 超时信息配置
            connection.setConnectTimeout(30 * 1000);
            connection.setReadTimeout(30 * 1000);

            // 建立实际的连接
            connection.connect();

            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();

            // 遍历所有的响应头字段
            log.info("遍历所有的响应头字段...");
            for (String key : map.keySet()) {
                log.debug(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            log.error("发送GET请求出现异常！" + e.getMessage());
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        log.info("发送返回信息:" + result);
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param, String pIP, int pPort) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            log.info("发送请求URL:" + url);
            URL realUrl = new URL(url);

            URLConnection conn = null;
            if (pIP != null && pIP.length() > 0) {
                Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(pIP, pPort));

                // 打开和URL之间的连接
                conn = realUrl.openConnection(proxy);
            } else {
                conn = realUrl.openConnection();
            }

            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Charsert", "UTF-8");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);

            // 超时信息配置
            conn.setConnectTimeout(30 * 1000);
            conn.setReadTimeout(30 * 1000);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            log.info("发送请求参数:" + param);
            out.print(param);

            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            log.error("发送 POST 请求出现异常！" + e.getMessage());
            e.printStackTrace();
        }
        // 使用finally块来关闭输出流、输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        log.info("发送返回信息:" + result);
        return result;
    }
}